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10 | Information on installation and operation
1400
For boiler output 50/30° [kW]
kW
Kesselleistung bei 50/30° [kW]
1200
Thermal output [kW]
Feuerungswärmeleistung [kW]
1000
800
600
400
200
0
0
20
40
Fig. 3 Graph
• Take fluctuating net calorific values of the gas into account; check the
maximum value with the gas supply utility.
• Only use burners that are suitable for the specified fuels. Observe the
burner manufacturer's instructions.
• Burners must only be adjusted by a competent person.
3.4
Installation requirements
The installation room must meet the following conditions:
• In the boiler installation room, an ambient temperature of between 0
°C and 35 °C must be ensured (refer to the requirements of BS 6644).
• The installation room must be equipped with the required air vents.
• An adequate supply of fresh air must be ensured.
The ventilation to the plant room must meet the minimum requirements
stated in the building regulations. Please consider the additional free
ventilation for open flue appliances.
Take into account additional consumers of ventilation air
(e.g. compressors) when sizing.
For boiler room ventilation sizes please refer to BS 6644 and IGE/UP/10.
Regarding the size of the combustion air vent, it is essential that the
system installer seeks the agreement of the responsible approval or
building regulations body.
B Never install system components that could be damaged by frost near
the combustion air vents. If necessary, install a device to preheat the
ventilation air (e.g. a heater battery in the combustion air vent).
B Never position objects in front of these vents. Keep the combustion
air vents free at all times.
B Never store flammable materials or liquids in the immediate vicinity of
the heat source.
3.5
Combustion air quality
B Keep the supply of combustion air free of corrosive substances (e.g.
halogenated hydrocarbons that contain chlorine or fluorine
compounds).
This will help prevent corrosion.
B Never use or store chlorinated cleaning agents or halogenated
hydrocarbons (as contained in spray cans, solvents or cleaning
agents, paints and adhesives, for example) in the boiler room.
B Keep the combustion air supply free of dust.
B If building work is taking place in the installation room and creating a
lot of dust, shut the boiler down. A burner contaminated during
building work must be cleaned before commissioning.
6 720 803 637 (2012/03)
60
80
%
100
6 720 648 053-28.1T
3.6
Heating water quality
The quality of the fill and top-up water is an essential factor for increased
efficiency, functional reliability, long service life and for maintaining the
constant operational condition of a heating system. If the system is filled
with water that has a high calcium hardness, this will be deposited on the
heat exchanger surfaces and will obstruct the transfer of heat to the
heating water. As a result, the wall temperatures of the stainless steel
heat exchanger surfaces will increase and the thermal stress (loads on
the boiler body) will increase.
This is why the quality of the fill or top-up water must meet the conditions
stipulated in the operator's log provided and be recorded in this log.
The conditions for boilers > 600 kW require general water treatment
independent of the water hardness and the volume of fill and top-up
water.
3.7
Using of antifreeze
Chemical additives that are not certified as safe for use
by the manufacturer must not be used.
Antifreeze based on glycol has been used in heating systems for many
years, for example Antifrogen N manufactured by Clariant.
The use of other types of antifreeze should not be a cause for concern if
the product is comparable with Antifrogen N.
Observe the antifreeze manufacturer's instructions. Follow the
manufacturer's details regarding mixing ratios.
The specific thermal capacity of Antifrogen N antifreeze is lower than the
specific thermal capacity of water. To enable the transfer of the required
heat output, increase the required flow rate accordingly. This should be
taken into account when sizing the system components (e.g. pumps)
and the pipework.
As the heat transfer medium has a higher viscosity and density than
water, take the higher pressure drop through the pipework and other
system components into account.
Check the resistance of all plastic or non-metallic components in the
system separately.
3.8
Control unit settings
The boiler needs to be operated with a Bosch CFB
control unit.
The purpose of optimum control unit settings is to achieve long burner
run times and avoid rapid temperature changes in the boiler. Gentle
temperature changes result in a longer service life of the heating system.
The control strategy of the control unit must therefore be prevented
from becoming ineffective, i.e. through the boiler water regulator
switching the burner on and off.
B Maintain the minimum differential between the selected shutdown
temperature of the high limit safety cut-out, the temperature
regulator, the maximum boiler water temperature and the maximum
temperature demand (
table 9).
The maximum boiler water temperature can be selected
on the control unit (MEC) in the "Boiler parameters"
menu, under menu item "Max. shutdown temperature".
B Select set temperatures for the heating circuits that are as low as
possible.
B Start heating circuits (e.g. when starting up in the mornings) at 5-
minute intervals.
Uni Condens 6000F
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